Attachment for oil-stoves



T J. R. DONNELLY.

ATTACHMENT FOR OIL STOVES. APPLICATION FILED AUG-18, 1919.

3 365. Patented Jan. 25, 1921.

v UNITED STATES PATENT OFFICE.

JOHN B. DONNELLY, O1 FAIRFIELD, MAINE, ASSIGNOB OI ONE-HALF TO DANIEL1B. DONNELLY, 0F FAIRFIELD, MAINE.

ATTACHMENT FOR QIL-STOVES.

Specification of Letters Patent.

Application filed August 18, 1919. Serial m. 318,109.

To all whom it may concern: 4

Be it known that I, JOHN R. DONNELLY, a-citizen of the United States,residing at Fairfield, in the county-of Somerset and State of Maine,have invented certain new the ordmary commercial oil stove are sepa;

rated by a considerable space, which allows free access of the outsideair and which has a very considerable cooling effect upon the heated.

The diameter oft e opening at the top of the chimney is very much lessthan the diameter of the grate and the heat arising from the chimney isconcentrated more or less within a limited space and is not properlydistributed over the bottom of the vessel or other article to be heated.

The object of my invention is, first, to prevent the free access of theoutside air to j the space beneath the vessel and, secondly,

to eiiect the even distribution of the heated air and gases arisin fromthe chimney of the stove, whereby t e heating efiect of the stove isgreatly accentuated.

In carrying out my invention, I interpose between the grate and the topof the chimney an annu ar shield which is preferably made with anupwardly flaring formation, the outer diameter of said shield beingsubstantially that of the grate or stove opening and the inner diameterbeing slightly greater than that ofthe chimney opening.

This construction is made more efiective by uniting with it a flanged orflaring guard surrounding the top of the chimney and separated from theshield by an annular' vent or air opening.

This attachment is peferably formed to fit the ordinary commercial blueflame stove and results in the increased efficiency of such stoves.

I have illustrated in the accompanying slightly larger than the openindrawing an attachment constructed accordmg to my 1m ention, applied tothe ordi-- nary Perfection oil stove, so called.

In the drawing:

Figure 1 is a section on the line 1-1 of 2, and

1g. 2 is a plan of the device.

2 represents the flat top of the oil stove contaming the opening 3, 4 isthe chimney havlng the contracted openin 5, and 6 is the ate upon whichis placed the article to be eated.

These parts are all common to the commercial oil stove and formnopart ofmy invention. The shield 7 is preferably an annular castin the outerdiameter being substantially t at of the grate so that it rests upon theedge of the stove opening 3 and the upper portion is hollowed out sothat the grate 6 rests on it in the same relative position as it restson the stove opening.

The inner diameter of the shield 7 is I 5 in the top of the c imney andthe shie d is made with an upwardly flarin form which is slightlycurved, or cup s aped, leaving a fiat, slightly tapering space beneaththe grate.

The chimney is protected from currents of air by a cylindrical uard 8havin' at its up er edge an outwar ly extending ange 9.

he guard 8 fits closely around the upper end of the chimney, extendinsomewhat above the same and it is suspen ed from 'the shield 7 byhangers 10, which are preferably formed integral with the casting 7 andsecured by suitable bolts 11 to the inner surface of the guard 8.

The effect of this attachment is to spread and evenly distribute thecolumn of heated air and gases which rise through the opening 5- andalso to protect the bott'om'of the grate and any vessel or articleplaced thereon to be heated, from the inrush of cold air which wouldotherwise mingle with the ascending column of heated air and gas.

The upper end of the chimney is also protected from the efiect oflateral drafts of air Patented Jan. 25, 1921.

which would otherwise have a disturbing upward flow of hot is checked orsmothered, this annular space furnishes a vent by which the excess gasesflow .ofi' around the sides of theburner and reheves any back pressurewithin the chimney.

An attachment constructed as above described has the efi'ect of makingthe oil stove far more efficient than when used without it,

by concentrating the heat, distributing the same, and by preventing thecooling efiect of the exterior a1r.

I claim:

1. An oil stove having a chimney, a grate above said chimney, anupwardly spreading annular shield interposed between the grate andchimney adjacent to the grate and an annular guard surroundingthe to ofthe chimney, its u per edge ing 0 greater diameter than t e lower ed eof said shield and spaced from said shiel to form an annular upwardlyand outwardly extending venting space.

2. An oil stove having a chimney, a grate above said chimney, anupwardly spreading annular shield interposed between the grate andchimney adjacent to the grate and an annular guard suspended from saidgrate surrounding the to of the chimney, its upper edge being 0 greaterdiameter than the lower ed of said shield and spaced from said sh1eld toform an annular upgrate fitting in said shield, a chimney, an

annular chimney guard suspended from said shield and fitting over theupper end of said chimney, leaving an upwardly and outwardly flaringventing space between said guard and shleld.

5. An oil stove having a grate opening, an upwardly flaring annularshield fitting 1n said opening, a grate above said shield, a

chimney, a chimney guard having an annu larfiange suspended from saidshield and fitting over the rig-per end of said chimney leaving an upwarventing space between said shield and gua In testimony whereof I havevaiiixedmy signature, 1n presence of two witnesses.

JOHN R. DONNELLY. Witnesses:

W. S. SIMPsoN, L. F. N

y and outwardly flarin

